Well, here are some of the new Letters...Kha can use these as opposition for...well, Kha, if he so wishes, although I don't know how they'll be integrated into the piece.

Spoiler for Letters (N-P):

N

Age: ??? years, after activation. Appearance wise, he looks to be 18/19.

Height: Around Quattordici’s, according the schematics.

Weight: Around Quattordici’s, according to schematics.

Hair colour: Orange.

Eye colour: Silver.

IS Skill: Sonic Revolver.

Biography:

N is the fourteenth of the Letters, and the one who is most proficient in the usage of dual firearms. He is paired with Quattordici in battle, and the pair are known to be two of the members of both groups that work the best together.

In terms of his attitude, he is a Letter who frequently sticks to the plot of the tasks he undertakes. He and his sister accomplish their duties well because of this trait, something that they have seemed to have inherited from senior members. N has even stated that he has followed the senior Numbers and Letters, holding them as examples of the team. That doesn't, however, limit his vacuous sense of humor, something that often irritates the more short-fused ones.

His IS, Sonic Carbine, affects his firearms- two weapons that take the form of two Colt Diamondbacks. This allows for faster reaction time and firing, hence "Sonic"- it is something of a unique skill, too, as it heightens the senses of the users as well as the speed. The one downside is that it expends a high amount of ammunition. N is also one who stands out in being the only Letter who uses ammo-fed weapons.

Name: O.

Age: ??? years, after activation. Appearance wise, he looks to be 25.

Height: Around Cinquedici's, according to schematics.

Weight: Around Cinquedici's, according to schematics.

Hair colour: Indigo.

Eye colour: Silver.

IS Skill: Scatter Quake.

Biography:

The fifteenth of the Letters, and the fifteenth to be activated. His IS required near-constant changing and modifications to operate normally. He is paired with Cinquedici in combat, and provides a long range heavy support/artillery role.

He bears an attitude similar to that of Quattro, much to the disdain and chagrin of some of his colleagues. He is often rather brash and condescending, even towards those who are his seniors. In this, he bears a trait similar to L, but the pair are made different by L downplaying his allies and the Numbers out of dislike, and O doing such out of pride or arrogance.

As such, his status in the group isn't exactly the highest. The one good factor, however, is that O is indeed willing to perform any tasks set- performing errands seems to be the one thing that he relishes the most

His IS Skill, Scatter Quake, is an oddity- using a pack on his back, O can, over a varying range of distances, send out shock-waves of different strengths through the air. This is primarily used for battlefield destruction to cause chaos amongst enemy ranks and to take out hostiles if possible, if they happen to be hit by them. Depending on the battlefield location, the effects can ultimately be cataclysmic

O can hold his own against a variety of foes, but his weakness is close range combat- therefore, he relies on his sister to provide close melee support for him as he carries out his duties. Out of all his allies, he has quoted her to be the one he trusts the most.

P

Age: ??? months, after activation. Appearance wise, he looks to be in his

Height: Around Settedici’s, according to schematics.

Weight: Around Settedici’s, according to schematics.

Hair colour: Teal.

Eye colour: Silver.

IS Skill: Glory Arms.

Biography: The sixteenth of the Letters, and the sixteenth to be activated. He finds his field of activity to be that of long-range support, and fights with Settedici in battle.

He is often described by many as the "Knight" of the Numbers and Letters. Chivalrous and vigilant, he will attempt to see to it that harm does not come to his brothers or sisters, through any means possible. This attitude of his has earned him respect from many.

His tone is well-educated, and some consider it to be noble, even. He is one of the few in either group who has a tendency to compliment foes should they put up a worthy struggle.

His IS, Glory Arms, takes the form of a duo of classical long-range weapons- none other than a longbow and a crossbow. He uses the latter more than the former, and has the power to make either appear at will. For his projectiles, he uses bolts of condensed magical energy in solid form. It should be noted that he works well with Sette as well as his usual partner, forming the tried and true long-range/short-range pairing.

Q, R, S and T will come later, and I still have to do M. I feel I might have rushed some of this...but I'll leave you to judge it, fellow readers.